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Home›Repair guides›Engine Lubrication System Priming

Cummins/Onan DF Series — Engine Lubrication System Priming

For the Cummins/Onan DF Series.

Applies to: Cummins Onan Df Series

Before you start

  • WARNING: Contact with rotating machinery can cause severe personal injury or death. Stay clear of rotating components and ensure that protective shields and guards are in place and secured before operating machinery.

Procedure

  1. Remove oil inlet line from turbo-charger housing, fill bearing housing with clean engine lubricating oil; replace line, secure.
  2. Fill crankcase to 'L' (low) mark on dipstick.
  3. Remove plug from head of oil filter housing and connect a hand or motor-driven priming pump from a source of clean lubricating oil to the plug boss in filter housing.
  4. Prime until a 30 psi (207 kPa) pressure is obtained.
  5. Disconnect wire from fuel solenoid valve, close throttle and crank engine while maintaining an external prime pressure of 15 psi (103 kPa), for 15 seconds.
  6. Remove external priming equipment, replace plug in filter housing and torque to 15 to 20 ft. Ib. (20 to 27 Nm).
  7. Reconnect wire to fuel shut-off valve.
  8. Complete oil fill to 'H' (high) mark on dipstick.

Tools required

  • Priming pump (hand or motor-driven)
  • Pressure gauge

Specs & torque values

  • 30 psi pressure
  • 15 psi external prime pressure
  • 15-20 ft-lbs filter housing plug torque

Source: manual:960-0604 Onan DFW DFY DFZ Installation Manual (11-1986).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.